利用沉积物中的碲将 PETM 与北大西洋火山活动联系起来

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2024-10-24 DOI:10.1016/j.palaeo.2024.112575
N.B. Baumann , M. Regelous , T. Adatte , N.R. Thibault , A. Regelous , B.P. Schultz , A. Fantasia , H. Madsen , K.M. Haase
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引用次数: 0

摘要

古新世-始新世热极盛期(PETM)是全球温度上升的一个短暂时期(∼170 kyr),始于 55.93 Ma,发生在北大西洋断裂和北大西洋火成岩带(NAIP)形成期间。最近,人们利用沉积物中的汞(Hg)浓度,试图将北大西洋火成岩带(NAIP)的喷发历史与这一时期的环境变化联系起来,其分辨率比地质年代学要高。在此,我们将沉积碲(Te)作为一种新的替代物,进一步以高分辨率重建 NAIP 火山活动。我们测量了北半球 PETM 3 个断面 401 个沉积物样本中的 45 种微量元素。所有研究地点的碲浓度和碲/钍比值在接近 PETM 开始时都有所上升,并在约 1 Myr 后的北大西洋主要火山灰阶段结束前一直保持较高水平。痕量元素数据表明,沉积物岩性或环境条件的变化并不影响沉积物中 Te 的浓度,这表明沉积物来源于火山。我们利用现有的年龄模型去除沉积速率变化的影响,并计算出火山Te通量。我们的 Te 数据表明,在古新世晚期和始新世早期,火山活动有所增加。这与 NAIP 现有的辐射年龄相吻合,后者表明格陵兰岛东部和法罗群岛超过 5 公里厚的熔岩是在∼56 至∼55 Ma 之间约 1 Myr 内喷发的。我们的所有研究地点在整个 PETM 期间都显示出类似的 Te 通量变化。相比之下,这些地点和其他地点的沉积汞(Hg)剖面则不太一致。沉积物中的碲可能是重建 NAIP 火山活动的有用替代物。
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Linking the PETM and North Atlantic volcanism using tellurium in sediments
The Paleocene – Eocene Thermal Maximum (PETM) was a short period (∼170 kyr) of global temperature rise starting at 55.93 Ma, which occurred during the breakup of the North Atlantic and the emplacement of the North Atlantic Igneous Province (NAIP). Recently, mercury (Hg) concentrations in sediments have been used in an attempt to connect the eruptive history of the NAIP with environmental change during this period, at a higher resolution than possible using geochronology. Here we present sedimentary tellurium (Te) as a novel proxy to further reconstruct NAIP volcanism at high resolution. We measured 45 trace elements in 401 sediment samples from 3 sections across the PETM in the northern hemisphere. All study sites exhibit an increase in Te concentrations and Te/Th ratios close to the onset of the PETM and remain high until the end of the main North Atlantic ash phase about 1 Myr later. The trace element data indicate that changes in sediment lithology or in environmental conditions do not influence sedimentary Te concentrations suggesting a volcanic source instead. We used existing age models to remove the effect of changes in sedimentation rate and calculated volcanic Te fluxes. Our Te data suggest increased volcanism in the latest Paleocene and early Eocene. This fits existing radiometric ages of the NAIP, which demonstrate that a more than 5 km thickness of lava in eastern Greenland and the Faroes was erupted within about 1 Myr between ∼56 to ∼55 Ma. All our study sites show similar Te flux variations across the PETM. In contrast, sedimentary mercury (Hg) profiles from these and other sites are less consistent. Tellurium in sediments may represent a useful proxy to reconstruct NAIP volcanism.
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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